My set-up for the track is the "poor-man's" method:
I purchased early heat exchangers ('73 or older), removed all the hoses, had a muffler shop cut the "boxes" out, and there it was: "equal" length headers to put into a dual-in single-out muffler. I picked up the early heat exchangers at a swap meet for $100, cost $20 for the muffler shop work.
I also picked up the muffler at a swap meet for $100. As an alternative, I have a Bursch muffler from eBay for $125.
I think I can really feel (and hear) a difference. I'm in California, so I can't run the headers on the street.
You can change the exhaust yourself. I think in some models you need to change the oil lines, but in my case, everything just bolted on! Make sure you have a long 8mm hex key for heat exchanger nuts.
A great resource is Wayne's 101 Projects book or the tech info here at Pelican's site.
Hope that helps!
Brian
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